Apparatus for casting molds or the like



Oct. 9, 1928. 1,687,450

R. M. HlNMAN APPARATUS FOR CASTING MOLDS OR THE LIKE Filed April 21, 1926 mt pkg.

INVENTOR. $54797 /Z ////1'/7/M/.

Patented Get. 9, 1928.

UNITED STATES.

ROBERT M. HINMAN, or AKRON, OHIO, AssIeNo 'ro THE STATE FOUNDRY la P TEEN COMPANY, or-nxao v, omo, .A ooaronarroivor oHro.

APPARATUS .ron CASTING MQLDS. on THE LIK Application filed April 21, 1926. s mi, m ma.

This invention relates to theart of casting iron or steel and particularly to an apparatus designed for the casting of circular molds which are used in the manufacture of inner tubes for use with pneumatic automobile ing having not been satisfactory, as after a few curmg operatlons the pores mthe metal,

tires. It is desirable in casting moldsv for the vulcanization of tires or tubes, or other articles of rubber, that the metal be chilled for the reason that chilling cast metal gives it a smooth, close grain which is particularly dey I molder is enabled to cast the metal'about a sii'able for the vulcanization of rubber. If the metal is not chilled, a porous, open surface will be formed in the metal which surface is not desirable. Attempts at, polishing or tinishing the surface of molds cast without chillopen up and reproduce an inferior surface in the rubber.

The present invention is for the purpose of constructing molds of special forms in which the molding cavity is formed with an overhanging portion which if cast about the usual chill may result in cracking of the casting upon cooling. The problem presented has been to construct a chill for the purposes set forth and for similar purposes. The (ice sign of chill hereshown is especially adaptable for this work and enables the metal to be cast without danger of breaking the chillor the casting, and while a tube mold has been shown, the principles of the invention may be applied to other objects.

The chill here shown is a two-part chill provided with a cushioning sand core or intermediate wall betweenthe parts. which wall permits the casting to contract without breakage. The chill is also constructed so that it can be withdrawn easily from the moldL In the drawings, in which one form of the invention is shown: 1

Figure 1 is a sectional'view through a mold showing the casting therein; and y Figure 2 is a plan view.

The molding apparatus comprises the usual drag 1 and cope 2 which are held in position by pins 3 passing through lugs 4 and by U-shaped clamps 5.

The casting is indicated by the numerallO, having the cavity 11 formed therein. It will be observed that this molding cavity is substantially circular in cross-section, the outer wallof the cavity overhanging the interior thereof. The line to which the finished mold ture of the cast metal.

ismachinedout'is indicated by the numeral 12. v p Attempts to form castings of this shape upon chills have been failures, prior to my invention, because of the fact that the contraction of the casting upon cooling about the chill will crack the castings, for the reason stated, this formof mold has heretofore been cast about sand cores with consequent inferior tex- By the use of my invention, however, the

chill. This is accomplished by the special de- 'sign'of. the chill to bedescribed.

formed of a sectional chill 17, the various sections and their. lines of division being shown 1n Flgure 2. These sections are bound together by a sultable tie 18 comprising a flexible cable or the like tied about the same in groove 18 andare spaced from the main portion of the. chill by a layer or wall of cushioning material, such',for example, as sand, shown at 19. f V e The remainder of the mold is made up in accordance with standard foundry practices being shown, but not described. 0

With a chill thus constituted, castings of the form shown,-or similar forms, may be made without danger of fracture upon cooling, the said layer 19 cushioning the two portions of the chill. The chill is easily removed by taking out the major or solid portion of the IPA-TENT: OF ICE chill and then several parts of the sectiona 1 ments of the invention'as will be apparent to 7 those skilled in the art to which this appertains.

What is claimedis: I

annular articles, comprising two annular portions. one of said portions beinga solid chill 1. A chill for forming annular cavities in therein, said chill comprising tWo annular cated between said portionsand acting as a: 10

portions, one of said portions being a solid chill and the other portion a sectional chill, and a layer of sand between the tWo portions of the chill.

3. A chill for casting circular molds having an undercut circular cavity therein, said chill comprising a solid ring portion and a sectional ring portion, and a Wall of sand 10- cushion therebetween.

4. A tWo part chill comprising a solid ring anda sectional ring adjacent thereto, and a layer oi sand between the parts of the chill to cushion said parts and permit radial con- 15 traction of the casting Without breaking.

ROBERT M. HINMAN, 

